Wooden patch making machine



Jarl- 1952 w. A. FORSYTH ET AL 2,583,3 7

WOODEN PATCH MAKING MACHINE Filed Aug. 19, 1946 3 Sheets-Sheet l I "VENT 0R5 WILL AUBREY oRsyru will ARTHUR DAY/S Jan. 22, 1952 w FQRSYTH ET AL 2,583,367

WOODEN PATCH MAKING MACHINE Filed Aug. 19, 1946 3 Sheets-Sheet 2 QJINVENTORS w/LL AUBREY FORSYTH WILL/AM ARTHUR DAV/S A T TOR N5 Jan. 22, 1952 w, FO S TH ET AL 2,583,367

' WOODEN PATCH MAKING MACHINE Filed Aug. 19, 1946 3 Sheets-Sheet 3 INVENTORS WILL AUBREY FORSYT/f WILL/AM ARTHUR DAVIS i Fig. 4 is a sectional view taken on 4-4 Patented Jan. 22, 1952 Columbia; and William Arthur Davis, Vancouver, British Columbia, Canada; Jean Mar- Forsyth, deceased In the plywood industry, particularlythat in which softwoods such as Douglas fir and the like are used, it is foundlexpedientg to remove knots and other defects'from the veneer and fill the hole resulting therefromc-with a piece ofjjwood cut to conform to the size and shape of said .hole. V j

" It is found desirable to usea patchof' uniform size and tobevel its edges so that 'when' it is pressed into place the patch will adhere tothe surrounding wood so securely that the patched material may be handled without the patch becoming detached at any part of its periphery.

The object ofthe present machine is to cut wood patches of identical size and form for this purpose and to do so both rapidly and economically. l s p The invention contemplates means for feeding a strip of material, means for cutting the strip into identical lengths and devices for rounding and bevelling the ends of said lengths as will be more. fully described in the following specification; and the accompanying drawings, in which:

Fig. 1 is a plan view of the invention.

Fig. 2 is anend elevational view as viewed from the right of Figure 1.

Fig. 3 is a front elevational View] j of 1.

Fig. 5 is a sectional View taken on 5--5 of 1.

Figs. 6 and 7 are detailvi'ews of the jaws "of the patch grip 'sliowii, open and closed respectively.

Fig. 8 is a transverse sectional, detail view of the strip feed table.

Figure 9 is a perspectiv'e view showing apatch ust after completiodand while still being held between the patch carrier and nmwucwn; the latter elements and cutters being shown by broken lines. I s V In the drawings like characters of reference ind-icatecorresponding parts: in each figure.

The numeral I indicates generally a frame having a' front wall 2 and side walls 3 and 4. which are connected togetherat their base by a horizontal bearer 6 (see Fig; 5) Journall-ed between the sidewall 3' and a horizontally disposed U-shaped bracket. 1 secured to the side wall 4,

Thedrive shaft 9 is fitted outside the frame with a drivepulley llllj which is to be driven by a fi supports avenues]. shaft l8- whicl1 supports a j'step and an upper bearing l9 and. 2! respectively,

jou'rnalled upon the shaft 50. being connected by a belt or chain 54 to the saw c'f'said Will Aubrey" Application August i9, 1eie, seiiaii-fo. with l 8 Claims. (01. 144-27- between which bearings .a; sleeve 22is journalled.

The sleeve 22 is fitted with the worm'wh'el IS, an edge cam 23, a face cam 24, and a chain sprocket 25, all'of which are rotated from the worml3.

A stationary sleeve 2] surrounds'the shaft 9 and is carried from the wall 3 and rockingly mounted thereon is a bell crank 28.

Thebell crank 28 has arms 29 and 3B. The

"arm 29 carrying at its outer end a roller 3| which rides on the surface of the face cam 24 and the arm 30 being forked as at 3-3 to engage one end of a connecting rod 34.

Mounted uponthe front wall 2 are'brackets- 36 upon which a strip feed table 31 is detachably mounted, the feedtable being provided with a channel 38'having' inwardly inclined sidewalls 39 which conform to the side edges of thestrip of material from whichthe patches are to *be made.

A U-shaped bracket 42 is mounted upon the front wall 2' of the frame I for the urpose of swingingly supporting a circular saw 43; The saw43 is mounted upon an arbor 44 which-extends through a bearing 46 and is provided with a driving pulley 4T. 7 V

The bearing 46" is carriedat the uppe'r'end of a swinging arm 49 which jdllflialled Within the bracket 42 on a shaft 50 earrie'd bysaidbracket. Pulleys 52 and 53* are coupled together and are The pulley 52 driving pulley 41- and the pulley 53 being connected by a belt or chain 55 to a pulley 56 upon the main drive shaft 9 whi'c'h ain turn is driven through a pulley l0 bya belt H from any suitable source of power not shown The bearing 46 is connected with. the bell crank 28 by the connecting rod 34 thus completing the operating train between the drive shaft 9 and the saw arbor 44. V

Mounted. upon the; front wall 2 is a vertical V guide 62 in which slide 63, having a strip receiving jaw 64, is; mounted.

The slide is provided on its rear side with a forked lug 66 and is engaged by alever G1 which is rocliingly mounted on. a shaft 68 carried between the vertical face of the U-shaped bracket l and the side wall 4. l V

The. lever 61 is provided intermediate its length-with a roller, HI which is adapted to ride in the groove of the edge cam 23.

The jaw 64 iseprovided. with a convexly curved V patch-supporting face 12 having front and rear libs ll? with vertical inner faces 14 which. are

spaced apart the full width of the patch material, i. e. the width of the lower face of the patch material as presented for processing in the channel 38 of the feed table 31 and as shown in Figuresfi and '7.

Slidably mounted in the jaw 64 is a non-rotatable stem 10 having a T head I? which terminates at the front with a concave faced jaw 18 and at the rear with a lug 19. The lug is provided with a set screw 80 which is adjustablyset to arrest the downward movement of the jaw 18 on its coming into contact with the top'edge of the front wall 2 as shown inFig. 4. h The stem 16 is threaded at its lower endasat- BI and provided with locknuts 82 between which and the lower jaw 64 is a compression spring 83 which causes the jaw I8 to close upon-a patch '84 and the jaw 64 when the slide 63 is raised to apoint where the set screw 80 is raised out of contact with the edge of the front wall 2.

A pair of aligned rails 86 are mounted on the top edge of the front wall 2 upon which a pair of slides 81 are adjustablyv supported. These slides carry a'journal housing 88 in each of which a spindle 89 is rotatablymounted.

' Each spindle is provided with a'pulley 90 at one end and a rotary cutter head 91 at the other.

The cutter heads arealigned' above the path of the patch strip and are provided with knives 92 conforming to the shape of the ends of the patch to be cut, which in the present instance is semi circular. The cutter heads 9| are driven in opposite directions from a suitable source of power by belts 93 engaging the pulleys 90.

On the right end of the front wall 2 (as viewed in Fig. 3) an upward extension llfi is provided to support an elongated bearing 91 in whicha shaft 98 is rotatably mounted. This shaft is fitted at its outer end with a quadrant 99 having patch engaging teeth I00, the peripheral lengthof the quadrant being equal to the-patches to be cut.

The inner end of the shaft 98 is fitted with a bevel pinion I02 which meshes with a similar pinion I03 secured to a vertical shaft I04.

The shaft I04 is mounted in bracketed bearings 4 I05, see Fig. 2, and is fitted at its base with a sprocket I06 through which it is driven by a chain I08 from the sprocket 25.

In operating the machine a strip of material which has been bevelled along its side edgesis inserted into the channel 38 of the feed table 3? "is advanced one patch length, the leading end is projected between open jaws 64 and I8, the jaws then close and the patch is cut off by the saw.

The jaws subsequently rise to advance the ends of the patch to the cutters until both ends are bevelled oil and the patch is but slightly below the axes of the cutters, the saw returns out of the path of the patch strip, the jaws are lowered and opened and the quadrant 99 in rotating again engages the patch strip to advance it and push the finished patch from between the jaws.

For each complete rotation of the worm wheel I the quadrant also rotates once through the sprocket 25, the chain I08, sprocket I06, the vertical shaft I04, and the quadrant shaft 98.

The cam 24 in-rotating once causes the bell crank 28 to rock rearwardly and forwardly, causing the saw 43 to swing in a corresponding direc- 4 I tion to cut the patch strip and subsequently to swing out of its path.

The cam 23 in rotating once, first raises the lever 61 as it initial movement, lifting the jaw 64 until it causes the patch, strip 34 to engage the jaw I8 when the compression spring 83 completes the grip upon the patch strip. Subsequent lift of the lever 61 raises the entire jaw assembly edge of the wall 2 when the downward movement of the upper jaw I8 is arrested and the lower jaw is carried down further against the action of the spring 83 to separate said jaws and allow the oncoming strip to remove the finished patch at the ends of the patch when said patch is fully elevated and the angle of the bevel of each end will decrease toward the side edges of the knives.

This decrease of angle is, twofold, first because the side edges of the patch strip are further below the centre of the cutters than the longitudinal centre and secondly on account of the increase in radius of the side edges of the knives over the centre portion.

The result of this decrease, partly incidental to the transverse curvature of the patch strip causes the bevel cut by the knives to merge into the bevel of the edges of the strip, so that when said strip is released from the jaws and returns to a flat condition, the bevel is constant around its entire perimeter and it can be relied upon to fit perfectly a recess in the surface plane of a board which has been made by any appropriate mechanical process. The completed patch still in its bent position, held between the carrier and I hold-down, appears in Figure 9.

A further object in the transverse distortion of the patch material is to provide said patch with such rigidity that the patch will stand up to the recurring impact of the knives without causing the fibre to be ragged.

What we claim as our invention is:

1. A patch making machine comprising means supporting and guiding a strip of patch stock for lengthwise advance, feed means operable intermittently to advance such strip by increments substantially equal to the length of a patch, cutoff means stationed along the line of advance and operable to sever a patch blank from the leading end of the strip following each incremental advance movement thereof, patch gripping means operable to clamp the severed patch blank by its opposite faces'and hold it securely therebetween with its ends projecting clear of such gripping means, a pair of cutters; means supporting said cutters for rotation, respectively, about stationary, spaced, and parallel axes extending transversely of the line of patch stock advance and disposed in a plane generally parallel to, and spaced from, a plane containing either opposite face of the severed pre-clamped patch blank; said cutters having cutting edges of a length to trim the full width of the patch blank ends; and means operable to shift said gripping means and patch blank clamped therebetween "greases .taneously by the respective cutters, saidshifting ,means; being further cperable t 'o shift said grip- ,iping means and patch blankback into' the line of 'patch stock advance to-be ejected-from the gripping meansby the end of the patch stock strip when next-incrementally advanced.

2.. Apatch making machine comprising patch gripping means operable to clamp an eldngated patch bl'ank'by its opposite 'facesland hold it securely therebetween with its ends projecting clear of such gripping means, a pair of cutters; means supporting said cutters for rotation, respectively, about spaced, parallel axes extending transversely of the elongate axis of the patch blank and disposed in a plane generally parallel to, and spaced from, a plane containing either opposite face of the pre-clamped patch blank; said cutters having cutting edges of a length to trim the full width of the patch blank ends; and shifting means operable to effect relative approach movement between said cutters and said gripping means, while the patch blank remains clamped thereby, in a direction normal to said planes, thereby to trim both blank ends simultaneously by the respective cutters.

3. The patch making machine defined in claim 2, wherein the gripping means comprises a pair of coacting clamp elements formed with convex and concave surfaces, respectively, to clamp the patch blank tightly therebetween and thereby bend and stress the patch blank about an axis generally parallel to its length to a predetermined curvature; the cutter edges being formed with a predetermined concave rounding, related to the curvature of bending of the blank, to trim with half-round curvature the ends of the patch blank presented to such cutters; and means limiting progressive movementof the clamp elements toward the cutters, at a position of the patch blank appreciably before it reaches the plane containing the cutters rotational axes, the curvature and radius of rotation of the cutters and the curvature of the blank being so interrelated that a substantially constant bevel is imparted to the rounded ends of the patch blank.

4. In a patch making machine, a pair of jaws having cooperating convex and concave surfaces, respectively, said jaws being operable to grip a generally flat patch blank and on the closing of said .jaws being operable to bend the patch blank under stress about an axis extending lengthwise of its grain; a cutter for beveling one end of the patch blank; said cutter being rotatable about an axis extending transversely of the patch blanks grain and substantially parallel to a plane containing the pre-bent flat surface of the patch blank, and means operable to effect progressively relative approach movement of said jaws and said cutter while the jaws thus grip the patch blank, for bringing such blank into progressive cutting contact with said cutter while maintaining said parallel relationship of the cutter axis and said plane.

5. A patch making machine comprising a frame, a carrier supported by said frame for carrying a patch blank thereon having opposite ends to be cut to desired shape, gripping means operable to hold such patch blank on said carrier, a pair of driven cutters having relatively wide transverse cutting edges which are shaped to impart corresponding configuration to respective opposite ends ofpatch blanks cut thereby, means supporting said driven cutters to rotate about spaced parallel axes disposed generally perpendicular to the length of the gripped patch blank between said 'ends therbbf and lying in a plane-generally parallel to the opposite faces, of such blank, and shifting meansoperable to effect relative approach movementbetwen saidcutters and the patch blank hldomsaidcarrierbysaid gripping means in the'direction' perpendicular to said plane, for presenting simultaneously both ends of theipatch blank to the respective cutters to" be' 'cut'simultaneou'sly thereby to tlfdconfiguration of said cutting edges.

6. The patch making machine defined in claim 5, in which the peripheries of the cutters are concave in cross section for cutting convexly rounded ends on the patch blank.

'7. In a patch making machine, a pair of jaws having cooperating convex and concave surfaces, respectively, said jaws being operable to grip a generally fiat patch blank elongated parallel to its grain and, on the closing of such jaws being operable to bend the patch blank under stress about an axis extending lengthwise of its grain; a cutter for beveling one edge of the patch blank, said cutter being rotatable about an axis extending transversely of the patch blanks grain and substantially parallel to a plane containing the pre-bent flat surface of the patch blank; means operable to advance said jaws progressively toward such cutter in a direction transversely of the patch blank while the jaws thus grip the patch blank, for bringing such blank into progressive cutting contact with said cutter while maintaining said parallel relationship of the cutter axis and said plane; and means terminating such progressive advance of said jaws before the blank reaches a plane parallel to the first mentioned plane and containing the cutters rotational axis.

8. A patch making machine comprising a grooved member supporting and guiding for lengthwise advance a strip of patch stock having oppositely beveled side edges, the groove of said member being of dovetail cross section and receiving the beveled strip in dovetailed interlocking and relative sliding engagement, feed means operable intermittently to advance such strip by increments substantially equal to the length of a patch blank to be cut, cut-off means stationed along the line of strip advance and operable to sever a patch blank from the leading end of the strip following each incremental advance movement thereof, gripping means operable to clamp the severed patch blank by its opposite faces with its ends projecting clear of such gripping means; a pair of cutters, means supporting said. cutters for rotation, respectively, about spaced, parallel axes extending transversely of the line of patch stock advance and disposed in a plane generally parallel to and spaced from, a plane containing either opposite face of the pre-clamped patch blank; and means operable to effect relative approach movement between said cutters and said gripping means, while the patch blank remains clamped therebetween, in a direction normal to said planes, thereby to trim both blank ends simultaneously by the respective cutters.

WILL AUBREY FORSYTH. WILLIAM ARTHUR DAVIS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 54,896 Hammer May 22, 1866 (Other references on following page) UNITED STATES PATENTS Name Date Linn Mar. 15, 1887 Fischer Dec. 12, 1893 Morris Apr. 10, 1894 Kellog Aug. 11, 1896 Elder Oct. 13, 1896 Seymour Mar.

Number Number 8 Name Date Nickerson Nov. 30, 1926 Madsen Jan. 29, 1929 Loetscher Mar. 5, 182 9 Jayne Aug. 4, 1 31 FOREIGN PATENTS Country Date Italy Aug. 24, 1929 

